Research Center Snow, Ski, and Alpine Sports, Austria; Department of Sport Science, University of Innsbruck, Austria.
Department of Sport Science, University of Innsbruck, Austria.
J Sci Med Sport. 2019 Aug;22 Suppl 1:S55-S59. doi: 10.1016/j.jsams.2019.01.015. Epub 2019 Jan 29.
Ski boots are designed to transfer forces from skier to ski. This transfer is among others affected by the flexion stiffness (FS) and so effects safety and skiing performance. Previous studies have used devices with prosthetic legs to evaluate FS, however, influencing factors like the foot and lower leg shape or individual buckle closure are not considered. The purpose of the study was to (i) develop a device to measure the individual flexion stiffness (IFS) of ski boots worn by skiers, to (ii) determine the repeatability of the measurement, and to (iii) compare the IFS with the nominal flex index of the manufacturers.
21 subjects were tested twice to assess repeatability. The IFS of 135 subjects were measured on ski slopes and compared with the nominal flex indices.
Repeated measurements revealed a correlation r of 0.98 (p<0.001) and a relative standard error of SEM=3.0%. The correlation between IFS and nominal flex index was moderate with r=0.64 (p<0.001). Post hoc analysis showed no statistical differences between flex index 80 and 90 (p=0.29) and flex index 100 and 110 (p=0.60).
The determination of IFS was sufficiently repeatable. Considerable differences were found between IFS and the nominal flex indices of the manufacturers. The introduction of a measurement standard may improve the comparability among the manufacturers. Our method is not suitable as standardization method due to the measurements with subjects. However, the data collected may provide a valuable baseline for a future standardization.
滑雪靴旨在将力从滑雪者传递到滑雪板上。这种传递受到柔韧性的影响，从而影响安全性和滑雪性能。先前的研究使用带有假肢的设备来评估柔韧性，但未考虑脚部和小腿形状或个体扣合的影响因素。本研究的目的是：（i）开发一种用于测量滑雪者穿着的滑雪靴的个体柔韧性（IFS）的设备；（ii）确定测量的可重复性；（iii）比较 IFS 与制造商的名义柔韧性指数。
21 名受试者进行了两次测试以评估可重复性。在滑雪道上测量了 135 名受试者的 IFS，并与名义柔韧性指数进行了比较。
重复测量显示相关性 r 为 0.98（p<0.001），相对标准误差 SEM=3.0%。IFS 与名义柔韧性指数之间的相关性适中，r=0.64（p<0.001）。事后分析显示，柔韧性指数 80 和 90 之间（p=0.29）和柔韧性指数 100 和 110 之间（p=0.60）无统计学差异。
IFS 的确定具有足够的可重复性。在 IFS 和制造商的名义柔韧性指数之间发现了相当大的差异。测量标准的引入可能会提高制造商之间的可比性。由于与受试者的测量，我们的方法不适合作为标准化方法。但是，收集的数据可能为未来的标准化提供有价值的基准。
